A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Outbound Port 25 Blocking for Dynamic IP Addresses
Authors : Takehito Akagiri
Koji Wakamatsu
Kouji Okada
Kaoru Maeda
Filename : draft-akagiri-op25b-dynamicip-00.txt
Pages : 34
Date : 2015-03-09
Abstract:
Outbound Port 25 Blocking has been widely used over a decade as a
countermeasure against mail spams. It is the operation to filter TCP
traffic which (1) the source IP addresses are dynamic IP addresses
and (2) the destination port is 25. Since ordinal mail message
submissions from dynamic IP addresses can be done via submission port
(port number 587), operators can introduce the blocking without
preventing ordinal mail message submissions. We explain current
OP25B operations in this document.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-akagiri-op25b-dynamicip/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-akagiri-op25b-dynamicip-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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